#include "drv_adc.h"
uint16_t adc_buf[100]={0};
void drv_adc1_init(void)
{
	GPIO_InitTypeDef  GPIO_InitStruct;
	ADC_CommonInitTypeDef  ADC_CommonInitStruct;
	ADC_InitTypeDef  ADC_InitStruct;
	DMA_InitTypeDef  DMA_InitStruct;
    
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
	RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2, ENABLE);		
	
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;//要采集模拟量，所以选模拟输入
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;//上下拉会干扰数据采集
	GPIO_Init( GPIOB, & GPIO_InitStruct);
	//ADC的公共部分功能的配置
	ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
	ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent;
	ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div4;//adcmax=36MHz,168/2/4=21MHz
	ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//采样延时5个周期
	ADC_CommonInit(&ADC_CommonInitStruct);

	ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;//使能连续转换（扫描）
	ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;//数据右对齐
	ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//不使用外部边沿触发
	ADC_InitStruct.ADC_NbrOfConversion = 1;//采集通道个数
	ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;//分辨率
	ADC_InitStruct.ADC_ScanConvMode = DISABLE;//两个以上的通道才使用扫描模式
	ADC_Init(ADC1, &ADC_InitStruct);
	
	DMA_InitStruct.DMA_BufferSize = 100;
	DMA_InitStruct.DMA_Channel = DMA_Channel_0;
	DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;//外设到内存
	DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
	DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)adc_buf;//目标地址
	DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
	DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//ADC寄存器为16位
	DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
	DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;//循环模式
	
	DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;//去DR寄存器的地址
	DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
	DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
	DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
	DMA_InitStruct.DMA_Priority = DMA_Priority_High;
	DMA_Init(DMA2_Stream0, & DMA_InitStruct);

	ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 1, ADC_SampleTime_84Cycles);//设置采样规则，采样时间
	ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);//设置DMA的触发条件，ADC1转换完后搬运数据
	ADC_DMACmd(ADC1, ENABLE);//使能ADC、DMA
	ADC_Cmd(ADC1, ENABLE);
	DMA_Cmd(DMA2_Stream0, ENABLE);
	ADC_SoftwareStartConv(ADC1);//软件触发ADC1开始转换
}
uint16_t drv_adc_average(void)
{
	uint8_t i=0;
	uint32_t sum=0;
	for(i=0;i<100;i++)
	{
		sum+=adc_buf[i];
	}
	return (uint16_t)sum/100;
}
